Timed charging control method and system for low-voltage battery of new energy vehicle

Abstract

The present invention provides a method and system for controlling the timed power replenishment of low-voltage batteries in new energy vehicles, belonging to the field of new energy vehicle control technology. When the vehicle controllers are in a dormant state, the on-board gateway wakes up after a set interval and sends a wake-up signal to the body system controller. After the body system controller receives the wake-up signal sent by the on-board gateway and is awakened, it determines whether the entire vehicle power supply is in an off state and the low-voltage battery voltage is at a minimum value. If so, the power replenishment function is triggered, and the body system controller sends a wake-up signal to wake up the entire vehicle controller, power battery management system, vehicle communication module and DC inverter to perform power replenishment control. If not, the body system controller enters dormancy. The present invention can not only ensure the safety, stability and reliable functionality of new energy vehicles, but also allow users to promptly understand the vehicle status and the effectiveness of intelligent functions.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle control technology, and in particular to a method and system for controlling timed power replenishment of a low-voltage battery in a new energy vehicle. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] As the technological and intelligent levels of new energy vehicles gradually improve, more and more controllers are installed on new energy vehicles. The increase in controllers will lead to an increase in static current when the vehicle is in sleep mode. Therefore, many new energy vehicles will be left idle for a long time, which will cause low-voltage battery power supply, causing great inconvenience to users in daily use.

[0004] The inventors found that some new energy vehicles on the current market are equipped with a low-voltage battery charging function, but the charging time is long, and when the charging function is triggered, all controllers on the CAN network are awakened. The intelligence and safety are poor, and users cannot tell whether the charging is successful, resulting in a poor user experience. Summary of the Invention

[0005] In order to address the shortcomings of the existing technology, the present invention provides a timed power replenishment control method and system for low-voltage batteries of new energy vehicles, which regularly monitors the power status of the vehicle's low-voltage battery. When the low-voltage battery is insufficient and there is a risk of power supply, the relevant controller is awakened at a fixed point to perform corresponding work when the judgment conditions are met, thereby improving the safety, stability and reliability of low-voltage battery power replenishment; at the same time, the vehicle power replenishment execution status is sent to the client through the vehicle communication module, so that the user can timely understand the vehicle status and the effectiveness of the intelligent function.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a method for controlling timed power replenishment of a low-voltage battery in a new energy vehicle.

[0008] A method for controlling the timed charging of a low-voltage battery in a new energy vehicle includes the following steps:

[0009] When the vehicle controllers are in sleep mode, the vehicle gateway wakes up after a set time interval and sends a wake-up signal to the vehicle body system controller;

[0010] After receiving the wake-up signal from the vehicle gateway and being awakened, the body system controller determines whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time;

[0011] If so, the charging function is triggered, and the body system controller sends a wake-up signal to wake up the vehicle controller, power battery management system, vehicle communication module and DC inverter to perform charging control; if not, the body system controller enters sleep mode.

[0012] As an optional implementation method, the power replenishment control includes:

[0013] After the vehicle controller, power battery management system, vehicle communication module and DC inverter are all awakened, the vehicle controller determines whether the power battery state of charge is greater than the minimum value and the high-voltage system is fault-free. If so, the vehicle controller sends a high-voltage relay connection request to the power battery management system and sends an enable signal to the DC inverter. If not, the vehicle controller determines that the charging has failed and sends a signal that the charging start condition is not met to the body system controller.

[0014] After the power battery management system receives the high-voltage relay connection request, the power battery management system connects the high-voltage relay. After the DC inverter receives the enable signal, the DC inverter performs the DCDC enable action.

[0015] As an optional further limitation, the vehicle controller determines whether the power replenishment is successful based on the high-voltage relay connection status and DCDC enable status. If successful, it sends a power replenishment execution success signal to the body system controller; otherwise, it sends a power replenishment execution failure signal to the body system controller.

[0016] As an optional further limitation, when the body system controller determines that the charging function is successfully executed based on the charging status signal sent by the vehicle controller, it continuously determines whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is a fault in the high-voltage system;

[0017] If at least one of the above four conditions is met, the body system controller sends a power replenishment exit signal to the vehicle controller; if none of the above four conditions are met, the body system controller periodically continues to judge the above conditions.

[0018] As an optional further limitation, after the vehicle controller receives the power replenishment exit signal, the vehicle controller sends a high-voltage relay disconnection request to the power battery management system, and the power battery management system executes and feeds back the high-voltage relay status to the vehicle controller;

[0019] After receiving the status feedback of the high-voltage relay, the vehicle controller sends a power replenishment completion signal to the body system controller. The body system controller sends a power replenishment status signal to the vehicle communication module. After the vehicle communication module sends the power replenishment status signal to the client, each controller enters sleep mode.

[0020] As an optional further limitation, when the body system controller determines that the charging function has failed to execute based on the charging status signal sent by the vehicle controller, the body system controller sends the charging status signal to the vehicle communication module. After the vehicle communication module sends the charging status signal to the client, each controller enters sleep mode.

[0021] A second aspect of the present invention provides a timed power replenishment control system for a low-voltage battery of a new energy vehicle.

[0022] A timed charging control system for low-voltage batteries in new energy vehicles, comprising: an on-board gateway, a vehicle controller, a body system controller, a power battery management system, a vehicle communication module, and a DC inverter. The on-board gateway communicates with the body system controller, which in turn communicates with the vehicle controller, the power battery management system, the vehicle communication module, and the DC inverter. The vehicle controller communicates with the power battery management system and the DC inverter.

[0023] The vehicle gateway is configured to wake up after a set time interval when the vehicle controllers are in a dormant state and send a wake-up signal to the body system controller;

[0024] The body system controller is configured to: receive the wake-up signal sent by the gateway, and determine whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time; if so, trigger the power replenishment function and send a wake-up signal to the vehicle controller, power battery management system, vehicle communication module and DC inverter for power replenishment control; if not, enter sleep mode.

[0025] As an optional implementation method, the vehicle controller is configured to: determine whether the power battery charge state is greater than the minimum value and the high-voltage system is fault-free; if so, send a high-voltage relay connection request to the power battery management system and send an enable signal to the DC inverter at the same time; if not, determine that the charging has failed, and send a signal that the charging start-up conditions are not met to the body system controller.

[0026] As an optional implementation, the power battery management system is configured to: connect the high-voltage relay after receiving the high-voltage relay connection request;

[0027] The DC inverter is configured to: perform a DCDC enabling action after receiving an enabling signal.

[0028] As an optional implementation method, the vehicle controller is also configured to: determine whether the power replenishment is successful based on the high-voltage relay connection status and the DCDC enable status; if successful, send a power replenishment execution success signal to the body system controller; otherwise, send a power replenishment execution failure signal to the body system controller.

[0029] As an optional further limitation, the body system controller is further configured to: determine whether the charging function is successfully executed based on the charging status signal sent by the vehicle controller, and continuously determine whether the following conditions are met: whether the vehicle power state is not off, whether the power battery SOC value is less than a minimum value, whether the low-voltage battery voltage value is greater than or equal to a maximum value, and whether there is a fault in the high-voltage system;

[0030] If at least one of the above four conditions is met, a power replenishment exit signal is sent to the vehicle controller; if none of the above four conditions are met, the above conditions are periodically judged.

[0031] As an optional further limitation, the vehicle controller is also configured to: after receiving the power replenishment exit signal, send a high-voltage relay disconnection request to the power battery management system, receive the high-voltage relay status feedback from the power battery management system, and send a power replenishment completion signal to the body system controller.

[0032] As an optional further limitation, the body system controller is further configured to: send a charging status signal to the vehicle communication module, and after the charging status signal is sent to the client, send a sleep signal to each controller;

[0033] The vehicle communication module is configured to send a charging status signal to the client.

[0034] As an optional further limitation, the body system controller is further configured to: determine, based on a charging status signal sent by the vehicle controller, that the charging function has failed to execute, send the charging status signal to the vehicle communication module, and after the charging status signal is sent to the client, send a sleep signal to each controller;

[0035] The vehicle communication module is further configured to send a charging status signal to the client.

[0036] A third aspect of the present invention provides a new energy vehicle, which utilizes the timed power replenishment control method for the low-voltage battery of the new energy vehicle described in the first aspect of the present invention.

[0037] A fourth aspect of the present invention provides a new energy vehicle, comprising the new energy vehicle low-voltage battery timed power replenishment control system described in the second aspect of the present invention.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The present invention discloses a method and system for controlling the timed recharging of low-voltage batteries in new energy vehicles. The present invention uses a gateway to regularly wake up the BCM controller to monitor the low-voltage battery voltage. When the low-voltage battery voltage is low and there is a risk of power supply, the relevant controller can be woken up at a fixed point, the execution conditions can be determined, and the corresponding recharging work can be performed. When the recharging process is abnormally interrupted or successfully completed, the system can send the vehicle recharging execution status to the client. This can not only ensure the safety, stability, and reliable functionality of the vehicle, but also allow users to promptly understand the vehicle status and the effectiveness of intelligent functions.

[0040] 2. The method and system for controlling the timed charging of low-voltage batteries in new energy vehicles described in the present invention transmit the vehicle charging execution status (charging success or charging failure) to the client through the vehicle communication module, allowing users to promptly understand the vehicle status and the effectiveness of intelligent functions.

[0041] 3. In the method and system for controlling the timed recharging of low-voltage batteries in new energy vehicles described in the present invention, when the body system controller determines that the recharging function has been successfully executed based on the recharging status signal sent by the vehicle controller, it continuously determines whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is a fault in the high-voltage system; if at least one of the above four conditions is met, the body system controller sends a recharging exit signal to the vehicle controller, further ensuring the safety of the timed recharging control of the low-voltage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0043] Figure 1 This is a flow chart of a method for controlling the timed power replenishment of a low-voltage battery in a new energy vehicle provided in Example 1 of the present invention.

[0044] Figure 2 This is a structural diagram of a timed power replenishment control system for a new energy vehicle low-voltage battery provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0049] Example 1:

[0050] like Figure 1 As shown, embodiment 1 of the present invention provides a method for controlling timed power replenishment of a low-voltage battery of a new energy vehicle, including the following process:

[0051] When the vehicle controllers are in sleep mode, the vehicle gateway wakes up after a set time interval and sends a wake-up signal to the body system controller BCM;

[0052] After receiving the wake-up signal from the vehicle gateway and being awakened, the body system controller BCM determines whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time;

[0053] If so, the charging function is triggered, and the body system controller BCM sends a wake-up signal to wake up the vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter to perform charging control; if not, the body system controller BCM enters sleep mode.

[0054] More specifically, the following processes are involved:

[0055] S1: System wake-up timer

[0056] When the vehicle controllers are in sleep mode, the onboard gateway wakes up every 2 hours and sends a wake-up signal to the body system controller BCM.

[0057] It is understandable that in some other embodiments, the timed wake-up interval of the vehicle gateway may also be 2.5 hours, 3 hours, 4 hours, and other intervals. Those skilled in the art can make any selection according to the specific working conditions or customize the design according to customer needs, which will not be described here.

[0058] In this embodiment, the vehicle gateway sends a wake-up signal to the body system controller BCM through the CAN network. It is understandable that in some other implementations, the vehicle gateway can also send a wake-up signal to the body system controller BCM through other networks such as LIN, MOST or FlexRay. Those skilled in the art can make a choice based on the specific network connection situation inside the new energy vehicle, which will not be repeated here.

[0059] S2: Body system controller BCM power replenishment trigger condition judgment

[0060] After the body system controller BCM receives the wake-up signal sent by the vehicle gateway and is awakened, it determines whether the vehicle power is in the OFF state (i.e., closed state) and the low-voltage battery voltage V x Is it V min If both of the above conditions are met, the charging function is triggered, and the body system controller BCM sends a wake-up signal to wake up the vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter; if any of the above two conditions is not met, the awakened body system controller BCM enters sleep mode.

[0061] In this embodiment, the vehicle controller VCU, generally serving as the central control unit of a new energy vehicle, is the core of the entire control system. It is primarily used to collect motor and battery status, accelerator pedal signals, brake pedal signals, actuator and sensor signals, and make corresponding judgments based on a comprehensive analysis of the driver's intentions. It then monitors the actions of the lower-level component controllers and is responsible for the normal driving of the vehicle, brake energy feedback, energy management of the vehicle's drive system and power battery, network management, fault diagnosis and processing, vehicle status monitoring, etc., thereby ensuring that the vehicle operates normally and stably with good power, high economy and reliability.

[0062] In this embodiment, the power battery management system BMS generally includes a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering the electrical equipment, and a collection module for collecting battery information of the battery pack; the power battery management system BMS is an important link between the on-board battery and the electric vehicle. Its main functions include: real-time monitoring of battery physical parameters, battery status estimation, online diagnosis and early warning, charge and discharge and pre-charge control balancing management, thermal management, etc.

[0063] In this embodiment, the vehicle communication module TBOX (Telematics Box) mainly includes functional modules such as a 4G module, a GPS module, a Bluetooth module, an Ethernet module, a CAN communication module, a telephone language module, a power module, an Airbag module, and an E / B-call module. Each module is closely connected to form a complete remote communication terminal.

[0064] In this embodiment, the body controller BCM is an electronic control unit used to control the body electrical system. Common functions include controlling power windows, power rearview mirrors, air conditioning, headlights, turn signals, anti-theft locking system, central locking, defrost device, etc. The body controller can be connected to other vehicle-mounted electronic control units through a bus.

[0065] S3: Vehicle controller VCU power supply start condition judgment

[0066] After the vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter are awakened, the vehicle controller VCU determines that the power battery state of charge SOC is greater than the minimum value SOC min And whether the high-voltage system is fault-free is met at the same time; if so, the vehicle controller VCU sends a high-voltage relay connection request to the power battery management system BMS, and sends an enable signal to the DC inverter at the same time; if not, the vehicle controller VCU determines that the power replenishment has failed, and sends a power replenishment start-up condition unsatisfied signal to the body system controller BCM.

[0067] In this embodiment, the state of charge (SOC) is a relative measure of the energy stored in the low-voltage battery, and is defined as the ratio of the charge that can be extracted from the battery cell at a specific time point to the total capacity.

[0068] S4: Low-voltage battery charging function execution and status feedback

[0069] After the power battery management system BMS receives the high-voltage relay connection request, the power battery management system BMS connects to the high-voltage relay. After the DC inverter receives the enable signal, the DC inverter performs the DCDC enable action.

[0070] The vehicle controller VCU determines whether the power replenishment is successful based on the high-voltage relay connection status and DCDC enable status. If successful, it sends a power replenishment success signal to the body system controller BCM. Otherwise, it sends a power replenishment failure signal to the body system controller BCM.

[0071] S5: Low-voltage battery charging status judgment

[0072] When the body system controller BCM determines that the charging function is executed successfully based on the charging status signal sent by the vehicle controller VCU, it continuously checks whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is any fault in the high-voltage system;

[0073] If at least one of the above four conditions is met, the body system controller BCM sends a power replenishment exit signal to the vehicle controller VCU; if none of the above four conditions are met, the body system controller BCM periodically continues to judge the above conditions.

[0074] After the vehicle controller VCU receives the power replenishment exit signal, the vehicle controller VCU sends a high-voltage relay disconnect request to the power battery management system BMS. The power battery management system BMS executes and feeds back the high-voltage relay status to the vehicle controller VCU.

[0075] When the body system controller BCM determines that the charging function fails based on the charging status signal sent by the vehicle controller VCU, the body system controller BCM sends the charging status signal to the vehicle communication module TBOX. After the vehicle communication module TBOX sends the charging status signal to the client, the body system controller BCM, vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter all enter sleep mode.

[0076] S6: Power replenishment completed and feedback

[0077] After receiving the status feedback from the high-voltage relay, the vehicle controller VCU sends a power replenishment completion signal to the body system controller BCM. The body system controller BCM sends a power replenishment status signal to the vehicle communication module TBOX. After the vehicle communication module TBOX sends the power replenishment status signal to the client, the body system controller BCM, vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter all enter sleep mode.

[0078] Example 2:

[0079] like Figure 2 As shown, embodiment 2 of the present invention provides a timed power replenishment control system for a low-voltage battery of a new energy vehicle, including: an on-board gateway, a vehicle controller VCU, a body system controller BCM, a power battery management system BMS, a vehicle communication module TBOX and a DC inverter. The on-board gateway communicates with the body system controller BCM, and the body system controller BCM communicates with the vehicle controller VCU, the power battery management system BMS, the vehicle communication module TBOX and the DC inverter respectively. The vehicle controller VCU communicates with the power battery management system BMS and the DC inverter respectively.

[0080] The vehicle controller VCU, generally serving as the central control unit of new energy vehicles, is the core of the entire control system. It is mainly used to collect motor and battery status, accelerator pedal signals, brake pedal signals, actuator and sensor signals, and make corresponding judgments based on a comprehensive analysis of the driver's intentions. It then monitors the actions of the lower-level component controllers and is responsible for the normal driving of the vehicle, brake energy feedback, energy management of the vehicle drive system and power battery, network management, fault diagnosis and processing, vehicle status monitoring, etc., thereby ensuring that the vehicle operates normally and stably with good power, high economy and reliability.

[0081] The power battery management system BMS generally includes a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering the electrical equipment, and a collection module for collecting battery information from the battery pack; the power battery management system BMS is an important link between the on-board battery and the electric vehicle. Its main functions include: real-time monitoring of battery physical parameters, battery status estimation, online diagnosis and early warning, charge and discharge and pre-charge control balancing management, thermal management, etc.

[0082] The vehicle communication module TBOX (Telematics Box) mainly includes functional modules such as 4G module, GPS module, Bluetooth module, Ethernet module, CAN communication module, telephone language module, power module, airbag module, E / B-call module, etc. Each module is closely connected to form a complete remote communication terminal.

[0083] The body controller BCM is an electronic control unit used to control the body electrical system. Common functions include controlling power windows, electric rearview mirrors, air conditioning, headlights, turn signals, anti-theft locking system, central locking, defrost device, etc. The body controller can be connected to other on-board electronic control units through the bus.

[0084] More specifically, they include:

[0085] The vehicle gateway is configured to wake up after 2 hours when the vehicle controllers are in sleep mode and send a wake-up signal to the body system controller (BCM);

[0086] It is understandable that in some other embodiments, the timed wake-up interval of the vehicle gateway may also be 2.5 hours, 3 hours, 4 hours, and other intervals. Those skilled in the art can make any selection according to the specific working conditions or customize the design according to customer needs, which will not be described here.

[0087] In this embodiment, the vehicle gateway sends a wake-up signal to the body system controller BCM through the CAN network. It is understandable that in some other implementations, the vehicle gateway can also send a wake-up signal to the body system controller BCM through other networks such as LIN, MOST or FlexRay. Those skilled in the art can make a choice based on the specific network connection situation inside the new energy vehicle, which will not be repeated here.

[0088] The body system controller BCM is configured to: receive the wake-up signal sent by the gateway, and determine whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time; if so, trigger the power replenishment function and send a wake-up signal to the vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter for power replenishment control; if not, enter sleep mode.

[0089] The vehicle controller VCU is configured to: determine whether the power battery charge state is greater than the minimum value and the high-voltage system is fault-free; if so, send a high-voltage relay connection request to the power battery management system BMS and send an enable signal to the DC inverter at the same time; if not, determine that the charging has failed, and send a signal that the charging start condition is not met to the body system controller BCM.

[0090] The power battery management system BMS is configured to: connect the high-voltage relay after receiving the high-voltage relay connection request;

[0091] The DC inverter is configured to: perform a DCDC enabling action after receiving an enabling signal.

[0092] The vehicle controller VCU is also configured to determine whether the power replenishment is successful based on the high-voltage relay connection status and DCDC enable status. If successful, it sends a power replenishment execution success signal to the body system controller BCM; otherwise, it sends a power replenishment execution failure signal to the body system controller BCM.

[0093] The body system controller (BCM) is further configured to determine the success of the recharging function based on the recharging status signal sent by the vehicle control unit (VCU), and continuously determine whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is any fault in the high-voltage system;

[0094] If at least one of the above four conditions is met, a power replenishment exit signal is sent to the vehicle controller VCU; if none of the above four conditions are met, the above conditions are periodically judged.

[0095] The vehicle controller VCU is also configured to: after receiving the power replenishment exit signal, send a high-voltage relay disconnection request to the power battery management system BMS, receive the high-voltage relay status feedback from the power battery management system BMS, and send a power replenishment completion signal to the body system controller BCM.

[0096] The body system controller (BCM) is further configured to send a charging status signal to the vehicle communication module (TBOX). After the charging status signal is sent to the client, it sends a sleep signal to each controller, so that the body system controller (BCM), vehicle control unit (VCU), power battery management system (BMS), vehicle communication module (TBOX), and DC inverter all enter sleep mode.

[0097] The vehicle communication module TBOX is configured to send a charging status signal to the client.

[0098] The body system controller (BCM) is further configured to: determine if the charging function has failed based on the charging status signal sent by the vehicle control unit (VCU), send the charging status signal to the vehicle communication module (TBOX), and after the charging status signal is sent to the client, send a sleep signal to each controller, so that the body system controller (BCM), vehicle control unit (VCU), power battery management system (BMS), vehicle communication module (TBOX), and DC inverter all enter sleep mode;

[0099] The vehicle communication module TBOX is further configured to send a charging status signal to the client.

[0100] Example 3:

[0101] Embodiment 3 of the present invention provides a new energy vehicle, including: an on-board gateway, a vehicle controller VCU, a body system controller BCM, a power battery management system BMS, a vehicle communication module TBOX, and a DC inverter. The on-board gateway communicates with the body system controller BCM, the body system controller BCM communicates with the vehicle controller VCU, the power battery management system BMS, the vehicle communication module TBOX, and the DC inverter respectively, and the vehicle controller VCU communicates with the power battery management system BMS and the DC inverter respectively.

[0102] The vehicle gateway is configured to wake up after 2 hours when the vehicle controllers are in sleep mode and send a wake-up signal to the body system controller (BCM);

[0103] It is understandable that in some other embodiments, the timed wake-up interval of the vehicle gateway may also be 2.5 hours, 3 hours, 4 hours, and other intervals. Those skilled in the art can make any selection according to the specific working conditions or customize the design according to customer needs, which will not be described here.

[0104] In this embodiment, the vehicle gateway sends a wake-up signal to the body system controller BCM through the CAN network. It is understandable that in some other implementations, the vehicle gateway can also send a wake-up signal to the body system controller BCM through other networks such as LIN, MOST or FlexRay. Those skilled in the art can make a choice based on the specific network connection situation inside the new energy vehicle, which will not be repeated here.

[0105] The body system controller BCM is configured to: receive the wake-up signal sent by the gateway, and determine whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time; if so, trigger the power replenishment function and send a wake-up signal to the vehicle controller VCU, power battery management system BMS, vehicle communication module TBOX and DC inverter for power replenishment control; if not, enter sleep mode.

[0106] The vehicle controller VCU is configured to: determine whether the power battery charge state is greater than the minimum value and the high-voltage system is fault-free; if so, send a high-voltage relay connection request to the power battery management system BMS and send an enable signal to the DC inverter at the same time; if not, determine that the charging has failed, and send a signal that the charging start condition is not met to the body system controller BCM.

[0107] The power battery management system BMS is configured to: connect the high-voltage relay after receiving the high-voltage relay connection request;

[0108] The DC inverter is configured to: perform a DCDC enabling action after receiving an enabling signal.

[0109] The vehicle controller VCU is also configured to determine whether the power replenishment is successful based on the high-voltage relay connection status and DCDC enable status. If successful, it sends a power replenishment execution success signal to the body system controller BCM; otherwise, it sends a power replenishment execution failure signal to the body system controller BCM.

[0110] The body system controller (BCM) is further configured to determine the success of the recharging function based on the recharging status signal sent by the vehicle control unit (VCU), and continuously determine whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is any fault in the high-voltage system;

[0111] If at least one of the above four conditions is met, a power replenishment exit signal is sent to the vehicle controller VCU; if none of the above four conditions are met, the above conditions are periodically judged.

[0112] The vehicle controller VCU is also configured to: after receiving the power replenishment exit signal, send a high-voltage relay disconnection request to the power battery management system BMS, receive the high-voltage relay status feedback from the power battery management system BMS, and send a power replenishment completion signal to the body system controller BCM.

[0113] The body system controller (BCM) is further configured to send a charging status signal to the vehicle communication module (TBOX). After the charging status signal is sent to the client, it sends a sleep signal to each controller, so that the body system controller (BCM), vehicle control unit (VCU), power battery management system (BMS), vehicle communication module (TBOX), and DC inverter all enter sleep mode.

[0114] The vehicle communication module TBOX is configured to send a charging status signal to the client.

[0115] The body system controller (BCM) is further configured to: determine if the charging function has failed based on the charging status signal sent by the vehicle control unit (VCU), send the charging status signal to the vehicle communication module (TBOX), and after the charging status signal is sent to the client, send a sleep signal to each controller, so that the body system controller (BCM), vehicle control unit (VCU), power battery management system (BMS), vehicle communication module (TBOX), and DC inverter all enter sleep mode;

[0116] The vehicle communication module TBOX is further configured to send a charging status signal to the client.

[0117] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for controlling the timed charging of a low-voltage battery in a new energy vehicle, characterized by: The following processes are included: When the vehicle controllers are in sleep mode, the vehicle gateway wakes up after a set time interval and sends a wake-up signal to the vehicle body system controller; Perform power replenishment control, including: After receiving the wake-up signal from the vehicle gateway and being awakened, the body system controller determines whether the vehicle power is off and the low-voltage battery voltage is at the minimum value. If so, the recharge function is triggered and the body system controller sends a wake-up signal to wake up the vehicle controller, power battery management system, vehicle communication module and DC inverter to perform recharge control. If not, the body system controller enters sleep mode. After the power battery management system receives the high-voltage relay connection request, the power battery management system connects to the high-voltage relay. After the DC inverter receives the enable signal, the DC inverter performs the DCDC enable action. The vehicle controller determines whether the power replenishment is successful based on the high-voltage relay connection status and DCDC enable status. If successful, it sends a power replenishment success signal to the body system controller; otherwise, it sends a power replenishment failure signal to the body system controller; After the vehicle controller, power battery management system, vehicle communication module and DC inverter are all awakened, the vehicle controller determines whether the power battery state of charge is greater than the minimum value and the high-voltage system is fault-free. If so, the vehicle controller sends a high-voltage relay connection request to the power battery management system and sends an enable signal to the DC inverter. If not, the vehicle controller determines that the charging has failed and sends a signal that the charging start condition is not met to the body system controller. When the body system controller determines that the charging function is successfully executed based on the charging status signal sent by the vehicle controller, it continuously checks whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is any fault in the high-voltage system; If at least one of the above four conditions is met, the body system controller sends a power replenishment exit signal to the vehicle controller; if none of the above four conditions are met, the body system controller periodically continues to judge the above conditions; When the body system controller determines that the charging function fails based on the charging status signal sent by the vehicle controller, the body system controller sends the charging status signal to the vehicle communication module. After the vehicle communication module sends the charging status signal to the client, each controller enters sleep mode and sends the vehicle charging execution status to the client through the vehicle communication module, allowing users to timely understand the vehicle status and the effectiveness of intelligent functions.

2. The method for controlling the timed power replenishment of a low-voltage battery of a new energy vehicle according to claim 1, wherein: After the vehicle controller receives the charging exit signal, it sends a high-voltage relay disconnect request to the power battery management system. The power battery management system executes and feeds back the high-voltage relay status to the vehicle controller. After receiving the status feedback of the high-voltage relay, the vehicle controller sends a power replenishment completion signal to the body system controller. The body system controller sends a power replenishment status signal to the vehicle communication module. After the vehicle communication module sends the power replenishment status signal to the client, each controller enters sleep mode.

3. A timed charging control system for a low-voltage battery of a new energy vehicle, which adopts the timed charging control method for a low-voltage battery of a new energy vehicle as described in any one of claims 1-2. Its characteristics are: include: On-board gateway, vehicle controller, body system controller, power battery management system, vehicle communication module and DC inverter. The on-board gateway communicates with the body system controller, and the body system controller communicates with the vehicle controller, power battery management system, vehicle communication module and DC inverter respectively. The vehicle controller communicates with the power battery management system and DC inverter respectively. The vehicle gateway is configured to wake up after a set time interval when the vehicle controllers are in a dormant state and send a wake-up signal to the body system controller; The body system controller is configured to: receive the wake-up signal sent by the gateway and determine whether the vehicle power is in the off state and the low-voltage battery voltage is at the minimum value at the same time; if so, trigger the power replenishment function and send a wake-up signal to the vehicle controller, power battery management system, vehicle communication module and DC inverter for power replenishment control; if not, enter sleep mode; After the vehicle controller, power battery management system, vehicle communication module and DC inverter are all awakened, the vehicle controller determines whether the power battery state of charge is greater than the minimum value and the high-voltage system is fault-free. If so, the vehicle controller sends a high-voltage relay connection request to the power battery management system and sends an enable signal to the DC inverter. If not, the vehicle controller determines that the charging has failed and sends a signal that the charging start condition is not met to the body system controller. When the body system controller determines that the charging function is successfully executed based on the charging status signal sent by the vehicle controller, it continuously checks whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than the minimum value, whether the low-voltage battery voltage value is greater than or equal to the maximum value, and whether there is any fault in the high-voltage system; If at least one of the above four conditions is met, the body system controller sends a power replenishment exit signal to the vehicle controller; if none of the above four conditions are met, the body system controller periodically continues to judge the above conditions; When the body system controller determines that the charging function fails based on the charging status signal sent by the vehicle controller, the body system controller sends the charging status signal to the vehicle communication module. After the vehicle communication module sends the charging status signal to the client, each controller enters sleep mode.

4. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 3, characterized in that: The vehicle controller is configured to: determine whether the power battery state of charge is greater than the minimum value and the high-voltage system is fault-free; if so, send a high-voltage relay connection request to the power battery management system and send an enable signal to the DC inverter at the same time; if not, determine that the charging has failed, and send a signal that the charging start condition is not met to the body system controller.

5. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 3, characterized in that: The power battery management system is configured to: connect the high-voltage relay after receiving a high-voltage relay connection request; The DC inverter is configured to: perform a DCDC enabling action after receiving an enabling signal.

6. The timed charging control system for low-voltage batteries of new energy vehicles according to claim 3, characterized in that: The vehicle controller is also configured to determine whether the power replenishment is successful based on the high-voltage relay connection status and the DCDC enable status. If successful, it sends a power replenishment execution success signal to the body system controller; otherwise, it sends a power replenishment execution failure signal to the body system controller.

7. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 3, characterized in that: The body system controller is further configured to: determine whether the charging function is successfully executed based on the charging status signal sent by the vehicle controller, and continuously determine whether the following conditions are met: whether the vehicle power status is not off, whether the power battery SOC value is less than a minimum value, whether the low-voltage battery voltage value is greater than or equal to a maximum value, and whether there is a fault in the high-voltage system; If at least one of the above four conditions is met, a power replenishment exit signal is sent to the vehicle controller; if none of the above four conditions are met, the above conditions are periodically judged.

8. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 3, characterized in that: The vehicle controller is also configured to: after receiving the power replenishment exit signal, send a high-voltage relay disconnection request to the power battery management system, receive the high-voltage relay status feedback from the power battery management system, and send a power replenishment completion signal to the body system controller.

9. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 8, characterized in that: The body system controller is further configured to: send a charging status signal to the vehicle communication module, and after the charging status signal is sent to the client, send a sleep signal to each controller; The vehicle communication module is configured to send a charging status signal to the client.

10. The timed power replenishment control system for low-voltage batteries of new energy vehicles according to claim 4 or 6, characterized in that: The body system controller is further configured to: determine that the charging function fails to execute based on the charging status signal sent by the vehicle controller, send the charging status signal to the vehicle communication module, and after the charging status signal is sent to the client, send a sleep signal to each controller; The vehicle communication module is further configured to send a charging status signal to the client.

11. A new energy vehicle, characterized by: A method for controlling the timed charging of a low-voltage battery of a new energy vehicle according to any one of claims 1 to 2; or, It includes the timed power replenishment control system for low-voltage batteries of new energy vehicles as described in any one of claims 3-10.

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